// Copyright 2019 The Cockroach Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// This software (KWDB) is licensed under Mulan PSL v2.
// You can use this software according to the terms and conditions of the Mulan PSL v2.
// You may obtain a copy of Mulan PSL v2 at:
//          http://license.coscl.org.cn/MulanPSL2
// THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
// EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
// MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
// See the Mulan PSL v2 for more details.

package tracing

import (
	"fmt"
	"strings"
)

// LogMessageField is the field name used for the opentracing.Span.LogFields()
// for a log message.
const LogMessageField = "event"

func (s *RecordedSpan) String() string {
	sb := strings.Builder{}
	for _, ev := range s.Logs {
		sb.WriteString(ev.String())
		sb.WriteRune('\n')
	}
	return sb.String()
}

// Msg extracts the message of the LogRecord, which is either in an "event" or
// "error" field.
func (l LogRecord) Msg() string {
	for _, f := range l.Fields {
		key := f.Key
		if key == LogMessageField {
			return f.Value
		}
		if key == "error" {
			return fmt.Sprint("error:", f.Value)
		}
	}
	return ""
}
